Vocabulary consisting only from characters you are able to read
残念
zannen
bad luck, regret, disappointmentjlpt4
数式
suušiki
numerical formulamix
熱血
nekkecu
hot blood/zeal/fervor/fervour/ardorleda1
丸める
marumeru
to make round, to round off, to roll up, to curl up, to seduce, to cajole, to explain awayichidan, verb, vtrans
交流
kourjuu
(1)(cultural) exchange, interchange, interaction, (inter-) mingling, (social, etc.) networking, intercourse, (2)alternating current, AC suru